Lancrans (French pronunciation: [lɑ̃kʁɑ̃]; Arpitan: Lancrens) is a former commune in the Ain department in the Auvergne-Rhône-Alpes region in Eastern France.

On 1 January 2019, it was merged into the new commune of Valserhône.

[2] In 1858, Vanchy (renamed Coupy in 1907, merged in 1966 into Bellegarde-sur-Valserine) and Confort separated from Lancrans to form new communes.

The town of Lancrans is located to the northeast of the Pertes de la Valserine, a small canyon where the Valserine runs partly underground.

It is similar to the former Perte du Rhône.